At the moment a hot cake is put in a cooler, the difference between the cakes and the cooler's
temperatures is 50° Celsius. This causes the cake to cool and the temperature difference loses
value every minute.
of its
Write a function that gives the temperature difference in degrees Celsius, D(t), t minutes after the cake
was put in the cooler.
D(t) =

D(t)= 50(4/5)^t

Explanation: If 1/5 of the temperature difference is lost each minute, that means 4/5 of the difference remains each minute. So each minute, the temperature difference is multiplied by a factor of 4/5 (or 0.8).

If we start with the initial temperature difference, 50° Celsius, and keep multiplying by 4/5, this function gives us the temperature difference t minutes after the cake was put in the cooler.

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

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